Physics
Mirage is due to:

Equal heating of different parts of the atmosphere
Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Magnetic disturbances in the atmosphere

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Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Interference of the sun light from water surface
Reflection of the sun light from water surface
Scattering of the sunlight by water molecules

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